Tooth mold



Dec. 19, 1933. c. E BECKER 1,939,639

TOOTH MOLD Filed May 18, 1931 I N VEN TOR.

CarZE Becker BY M Z4 ATTORNEY.

Patented Dec. 19, 1933 UNITED STATES PATENT OFFICE,

1,939,639 I 'roo'm MOLD Carl E. Beclter, Camden, N. J. App ication Mayis, 1931. Serial No. 538,370 3 Claims. (01. 18-42) 5 permit of the rapidproduction of perfectly formed teeth and wherein the mold consists ofeasily assembled separable sectionswhich may be readily united toproduce a composite mold having registering depressions or pockets forthe reception of the ceramic tooth forming materials and wherein theexterior sides of the assembled mold are shaped so that the mold maybereceived within a press adapted to hold the sections of the mold inassembled relationship, to apply pressure to the tooth forming materialscontained therein and to permit of the drying of the materials while inthe press by the application of heat.

It is another object. of the invention to provide a mold of thischaracter comprising a drag composed of a pair of outer sections andacenter section, said center section having its side walls provided witha plurality or pocketsor cavities of tooth-like form adapted to bebrought into registering relationship with corresponding pockets orcavities formed on the inner walls of the outer sections, and whereinprovision is made for assembling the sections of the drag in properrelative registration to insure accurate registration of, the'cavitiesand to prevent reversal in position of the center section.

It is a further object of the invention to provide a tooth mold of thistype whereby through the medium of the center section of the drag, twoor more rows of'teeth may be, produced in a single mold, and wherein thecope section of the mold comprises a single unitary member havingpockets formed in its under surface arranged in parallel rows toregister with the pockets or cavities provided in the several sectionsof the drag. g

It is another objector the invention to form the exterior surfaces ofthe assembled mold in inclined planes whereby when the mold ispositioned in a drying press and clamped between the stationary base andmovable members of the press, several sections of the mold will beforced together and rigidly retained in proper assembled relationship.

It is another object ofthe invention to provide the exterior surfaces ofthe molds with heat conducting grooves or channels,rwhereby during thepressing operation the molds may be heated and gas uniformly circulated'thereabout to secure the desired drying of the teeth being formedtherein. l

With these and other objects in view, which will appear as thedescription proceeds, the invention consists in the novel features ofconstruction, combinations of elements and arrangement of partshereinafter to be more fully described and pointed'out inthe appendedclaims.

Figure 1 is aperspective view of the cope of a tooth mold formed inaccordance with the present invention,

Figure 2 is aperspective view showing in sep- 55 arated relationship theseveral sections of the drag of my improved mold,

Figure 3 is a'transverse sectional view through the assembled mold whenpositioned in a drying press.

Referring more particularly to the drawing, the numeral 1 designates themold in its entirety. The mold comprises a cope which is designatedgenerally by the numeral 2 and a drag correspondingly designated by thenumeral 3. The drag comprises a pair of outer sections 4 4 and a centersection 5. These sectionsare preferably formed from a non-corrosivemetal which when cast presents smooth unroughened surfaces. Alloyscontaining brass or'bronze may be used in this capacity. v

The center section 5 consistsof a longitudinally extending bar havingflat parallel vertical sides indicated at 6. These side surfaces haveformed therein, during the process of producing 35 vthe bar 5, aplurality of pockets or cavitiesjGa shaped in accordance with theformation of portions of human teeth and disposed on both sides of thecenter bar in parallel orderand communicating openly with the upper edgeof the center bar. Similarly, the outer sections 4 are each formed toinclude a flat inner vertical surface '7 which closely engages andregisters with the side surfaces 6 of the center section or bar. Thesurfaces 7 are likewise formed with pockets or cavities 8 in the upperportions thereof which exactly register with the marginal portions ofthe pockets 6a provided in the center bar.

To insure this registration the center bar has its ends on one sideprovided with short shouldered recesses 9, while the opposite sides ofthe ends of the bar 5 are formed with what may be termed long recesses10. Similarly, one of the sections 4 has its ends, which register withthe recesses 9, provided with relatively short locking projections 11,while the complemental bar whereas the main length of the bar is ofsubstantially rectangular configuration, and the cross-sectionalformation of the sections 4 is matched accordingly. The long and shortrecesses 9 and 10 in the ends of the bar 5 serve to insure properregistration between the recesses of said bar and the complementalrecesses, cavities or pockets formed in the outer sections 4, thuspreventing the reversing in position of the center'bar and assuring itsassembly in the completed mold in but one operating position. One of thedrag sections 4 may be provided with transversely extending pins 13contiguous to the ends thereof, which pins pass throughopenings' 14formed in the ends or" the center bar and into sockets 15 formed in theother of the sections 4, a

. feature which further secures the necessary-high degree of accuracy inthe alignment and relative registration of the drag sections of themold.

' The cope section preferably comprises a single piece of metal which isof a width corresponding to the total width of the several sections ofthe drag when the'latter are joined together.

The cope section rests directly uponthe'upper the drying press.

surfaces of the drag sections and may be provided with one or moredepending pins 16 which are received in sockets 17 formed in the outersections 4 near the ends of the latter. The lower substantiallyhorizontal surface of the cope is provided with a pair of spaced rows oflongitudinally extending pockets or cavities 18, which register with thepockets and cavities 5a and 3 forming sections of the drag, whereby whenthe mold is in assembled order, as shown in Figure 3, the pockets orcavities in the several sections of the mold present closed cells oftooth formation into which the ceramic materials, used in the formationof artificial teeth, are pressed and forced into the desired tooth form.By this construction each' mold is capable of producing two rows ofartificial teeth, which is in contrast to the disclosures contained inmy prior application Serial Number 279,226 filed May 21, 1928, of whichthis application is a continuation in part and in which priorapplication but one row of teeth can be produced in the mold therein setforth.

As shown in Figure3, the drag and cope sections of the mold are providedwith longitudinally extending exterior inclined surfaces 19 and thesesurfacesare further formed with a plurality of relatively intersectinggrooves or channels 20. When the mold is used the cope section isremoved from the drag sections while the latter are held in assembledrelationship by any suitable means; The plastic ceramic materials maythenbe placed in the" pockets 6a and 8 of the drag and likewise theplastic ceramic material may be placed in the pockets 18 of the cope.;The

cope is then placed on the drag with the pins 16 thereof fitting in thesockets 1'7, The entire assembled'mold is then positioned between thestationary and movable members21 and 22 of These members 21 and 22 areformed with registering complemental'grooves 23 having inclined wallscorresponding to the inclination of the surfaces 19. Then the movablemember is forced into pressure engagement with the cope section,producing corresponding pressure on the drag with the result. that thepress established forces are directed inwardly toward the center of theassembled mold from all sides, thereby holding the mold rigidlyassembled, preventing relative'movement between the sections thereof andapplying requisite pressures to the tooth forming material present inthe mold cavities. During this pressing operation the molds are heatedby means of fuel burners 24, arranged beneath the stationary member 21and so disposed as to direct combustion gases upwardly and thencethrough and around the mold proper by passing through the grooves orchannels 20. This produces a uniform heating of the mold and itscontents to secure the desired drying and quick setting of the ceramicteeth contained in the mold. Following a proper period of pressing andheating the mold is removed from the press and the sections of the moldare allowed to lfall apart which permits the teeth, which have receivedaprimary heat treatment in the press,

to be readily removed from the sections of the mold and transferred. toother operations with but a minimum loss in time. The sections of thedrag may then be reassembled and the operations above given repeated.

What is claimed is:

1. A 'mold for producing artificial teeth comprising a drag formed toinclude a center section and a pair of separable and adjoining outersection's, said center section having its vertical sides provided withrows of spaced tooth forming cavities, the outer sections of said draghaving the vertical surfaces thereof which adjoin said center sectionformed with cavities arranged in registration with the cavities in thecenter section, interengaging shouldered means formed between the centerand outer sections of said mold for maintaining said center section in apredetermined order of assembly with said outer sections, and a singlecope section formed to seat upon the upper surfaces of said dragsections, said cope section possessing a width correspondingsubstantially to that of the total width of the assembled drag sections,the under surface of said cope section being provided with spaced rowsof cavities arranged to register with the cavities provided in'the dragsections, said cavities being relatively spaced and non-communicatingwhen said mold sections are in assembled ties in the center bar,shouldered interengaging means formed between the center and outer barsof said drag to limit said bars to a single predetermined order ofassembly, a singleccpe bar seated upon'the upper surfaces of. the dragbars,

said cope bar being of a width substantially cor- I responding to thetotal width of the assembled drag bars and of approximately the samelength as each of said latter bars, the under surface of said cope barbeing provided with spaced rows of cavities arranged to register withthe cavities. provided inthedrag bars, and means for obtainingpredetermined registration in assembly between said cope bar and saiddrag bars. I 3. A mold for producing artificial teeth comprising a dragformed to'include a center section and a pair of separable and adjoiningouter sections, said center section having its vertical sides providedwith rows of spaced tooth forming cavities, the outer sections of saiddrag having the vertical surfaces thereof which adjoin said centersection formed with cavities arranged in registration with the cavitiesin the center section, in-

. terengaging shouldered means formed between the center and outersections of said mold for maintaining said center section in apredetermined order of assembly with said outer section, and a singlecope section formed to seat upon the upper surfaces 01' said dragsections, the under

